Bubble level



FIG. 1 is an isometric view showing the bubble level of my new design;

FIG. 2 is a side elevational view of the bubble level with the opposite side being a mirror image thereof;

FIG. 3 is an end elevational view of the bubble level;

FIG. 4 is an elevational view of the bubble level of the end opposite the end shown in FIG. 3;

FIG. 5 is a top plan view of the bubble level; and,

FIG. 6 is a bottom plan view of the bubble level. 

The ornamental design for a bubble level, substantially as shown and described. 